Não informado. (1968). Philosophy and History. Institute for Scientific Co-operation.
Chicagoスタイル(17版)引用形式Não informado. Philosophy and History. Tubingen, Alemanha: Institute for Scientific Co-operation, 1968.
MLA(8版)引用形式Não informado. Philosophy and History. Institute for Scientific Co-operation, 1968.
警告: この引用は必ずしも正確ではありません.